Base for an electric fan



FIG. 1 is a right side elevational view of a base for an electric fan showing my new design, the left side being a mirror image of that shown;

FIG. 2 is a front and left side perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken line showing of a fan head assembly in FIG. 1 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a base for an electric fan, as shown and described. 